Robert L Millet wrote an article for the Ensign back in March of 1998. He was telling about the coming of Elijah the prophet to Joseph Smith Jr. on April 3, 1836. Here is a quote of what he had to say.
"The Prophet Joseph Smith's account continues: 'After this vision had closed, another great and glorious vision burst upon us; for Elijah the prophet, who was taken to heaven without tasting death, stood before us, and said: Behold, the time has fully come, which was spoken by the mouth of Malachi--testifying that he [Elijah] should be sent, before the great and dreadful day of the Lord come--to turn the hearts of the fathers to the children, and the children to the fathers, lest the whole earth be smitten with a curse' (D&C 110: 13-15). Precisely on that day in 1836 when Elijah's appearance took place, Jews throughout the world were engaged in the celebration of the Passover. Since the time of Malachi, four centuries before Christ's mortal birth, Jews worldwide have awaited Elijah's coming at Passover with anxious anticipation. Elijah came, but not to Jewish homes; he came rather to a temple of the Saints and to his legal administrator on earth, a descendant of Joseph and Ephraim. There Elijah bestowed keys of inestimable worth."